It's pretty good considering you did it in an hour. You're probably right in saying you used too many gradients though, especially on the cat. Gradient shading on 3D objects like a cat doesn't really work that well, the white shading on his front makes the cat appear completely smooth and cylindrical. It could look better if you drew the shadows in manually. A few nitpicky things as well, if it was me, I would smooth out his whiskers and make his eyes a little bigger. His legs are also pretty low down. And there are white lines on the top and right sides of the image, you should try cropping them out. You did well in the shape of the cat's head, his expression it pretty good too. Good work!!
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